Originally Posted by 2000SilverBullet
Make sure you are using at least 94 octane.
First check your STFT And LTFT
What is a normal range for each
The idea is for them to both be at 0. Being more or less than that means the computer is adding or taking away fuel because it sees a rich or lean condition. With a good tune they should be very close if not dead on 0. If your fuel trim is at -3.2 and you go WOT, it will lock in on -3.2 and will pull 3.2% fuel throughout your whole WOT run. This is obviously not good and can cause KR. This is the best way I can think to word it anyways. This can also cause inconsistant 02 readings from run to run and track passes and whatnot because one run it might be adding 5% fuel and the next one it might be pulling 5%.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!